In the seconds that followed her death, Sam and Dean were overcome by a sense of dread. Their foolproof plan was just thwarted by a mother trying to protect her child. They couldn't be mad at her for doing what any decent human being would do, and thus were conflicted over her actions. But they knew that if something didn't happen soon, they were screwed.
Meanwhile in his crib, Crowley had watched the scene before him with confusion. As his mind had conformed to the body he was in, he couldn't understand what happened, but it frightened him. But that was okay, because he could call Mummy and she would make everything better.
"Ma Ma." He cooed. Then he waited. A few seconds passed by, and he frowned. Mummy wasn't here. That never happened. His Momma always came when he called. So, he tried again.
"Ma Ma." And he waited some more. When she still didn't come, his lip began to quiver and his eyes filled up with tears as he started to cry. Then, suddenly, someone was picking him up by the armpits. His tears halted as he looked up in bewilderment.
Lucifer had picked him up. "Is that your Mommy down there?" He crooned in a sickly sweet voice. "Well, Mommy isn't going to be there for you anymore." He sat him back down in the crib to deal with him properly.
Even as he spoke the words, he had not noticed the magic taking place.
Despite being blood covered, the necklace Rowena had put on that morning had begun to glow when her son began to cry. A bluish light surrounded it, and the light grew strong enough to make Lucifer look down. The light brightened until it was blinding, and then, in a flash, A blue ghostly figure of Rowena stood in front of the crib.
"Why does this not surprise me?" Sam heard himself murmur. Dean shrugged.
Lucifer narrowed his eyes at her. So, she had a back up plan after all? Well, no matter. He would finish off the rugrat with time to spare. But when he went to attack, he couldn't get past the ghostly figure. It was solid, like a human would be, but it was impervious to every attack he tried.
"What is this magic?!" Lucifer cried after the sixth failed attempt on the infant's life.
Nobody in the room understood what was going on, until a thought came to Dean. He thought of his own mother giving up her life to save Sammy. Perhaps Rowena had found a way to use this to protect him. He had been quiet while this was going on, but he spoke, surprising even himself.
"It was her sacrifice." He whispered. Sam looked at him, confused, as did Lucifer, who hadn't realized he was there. He thought he should probably be afraid that Lucifer would kill him, but he also knew that Lucifer wanted an answer, and wouldn't kill him until he got one.
"What? What are you talking about?" Asked Sam.
"She sacrificed herself on purpose." He realized. "She must have known that her sacrifice must have made it impossible for Lucifer to touch him."
"But why?" Sam pressed.
At the thought of his own mother, and how her sacrifice had helped protect them from an angry poltergeist in their old home in Kansas so long ago, Dean had to swallow to get rid of the obstruction in his throat. "Because a mother's love is a powerful thing."
Rowena's ghost nodded. When Lucifer had been sufficiently distracted, She had run to add the last ingredient to send Lucifer back to the cage. To banish him, she had to prepare a mixture of herbs and liquors, aligned a black candle in a hexagonal position encircling a blood sigil consisted with an encircled pentagram with various Enochian runes, an athame to draw blood from left hand palm, and a spit of saliva in right hand palm. After all ingredients were prepared, Rowena's ghost recited an Enochian incantation and clapped her hands as she spoke:
"Anan avar kavak."
In a burst of light, Lucifer was gone.
Sam and Dean stood there for a moment, dumbstruck, before they moved into the nursery. They almost didn't see Crowley get out of the crib, onto the floor, and crawled over to his mother's body. He curled up under her still warm arm, and fell asleep. When they saw that, they cringed. Then, they looked to Rowena's ghost.
"This was your plan all along, wasn't it?" Dean whispered. She nodded, fearful of waking her son. She put a finger to her lips to hush them, preserving her son's sleep.
Crowley awoke an hour later. When his eyes opened, someone picked him up and sat him down in the crib. But before he could see who it was, someone was saying words he didn't understand, and then he blacked out.
A bright light made every one in the room shut their eyes. When they opened them again, they were surprised. For the first time in weeks, Crowley was back in his adult vessel. He was about to greet the Winchester boys when he saw blood on the floor. His eyes followed the puddle until he saw that it was his mother. But standing right behind the body, was a blue colored, ghostly version of his mother.
"Mummy?" He asked confused. She smiled gently and nodded to him. The figure came close to him and ran a hand down his cheek. He had so many questions, but that gesture told him everything he needed to know. He nodded slowly. "I will get you back. I promise." He swore. She nodded, then stepped away. In a flash of blue light, she disappeared as quickly as she had come.
He looked at the Winchesters for answers when Castiel came in and saw Rowena's body. He shut the door quickly and looked to the other two for information. Both boys sighed and then gave a shortened version of events. But Crowley kept trying to figure out how he could save his mother now.
A knock at the door interrupted his thoughts. He went to answer the door despite the Winchester's protests and, sensing that it wasn't a demon, opened it.
To his surprise, there stood Chuck Shurley.
